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page allocator: inline __rmqueue_smallest() 

Inline __rmqueue_smallest by altering flow very slightly so that there is
only one call site.  Because there is only one call-site, this function
can then be inlined without causing text bloat.  On an x86-based config,
this patch reduces text by 16 bytes.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2009-06-16 15:32:04 -07:00 committed by Linus Torvalds
parent a56f57ff94
commit 728ec980fb
1 changed files with 16 additions and 4 deletions
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20
mm/page_alloc.c
View File

@ -661,7 +661,8 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
* Go through the free lists for the given migratetype and remove
* the smallest available page from the freelists
*/
static struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
static inline
struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
int migratetype)
{
unsigned int current_order;
@ -831,8 +832,7 @@ static struct page *__rmqueue_fallback(struct zone *zone, int order,
}
}
/* Use MIGRATE_RESERVE rather than fail an allocation */
return __rmqueue_smallest(zone, order, MIGRATE_RESERVE);
return NULL;
}
/*
@ -844,11 +844,23 @@ static struct page *__rmqueue(struct zone *zone, unsigned int order,
{
struct page *page;
retry_reserve:
page = __rmqueue_smallest(zone, order, migratetype);
if (unlikely(!page))
if (unlikely(!page) && migratetype != MIGRATE_RESERVE) {
page = __rmqueue_fallback(zone, order, migratetype);
/*
* Use MIGRATE_RESERVE rather than fail an allocation. goto
* is used because __rmqueue_smallest is an inline function
* and we want just one call site
*/
if (!page) {
migratetype = MIGRATE_RESERVE;
goto retry_reserve;
}
}
return page;
}